摘要
为探究桥面临时设施作用下主梁涡振性能及表面风压分布情况,采用计算流体力学方法开展了某大跨悬索桥主梁涡振的模拟,研究了临时设施致主梁涡振时的流场演变特点,并利用本征正交分解法分析了主梁表面压力的时空分布特征.结果表明,临时设施导致主梁顶部流场产生了较大旋涡,但主梁未涡振时旋涡形态基本保持稳定.主梁涡振发生时的一个周期内,顶部旋涡相继发生了分离、再附着与脱落现象,即主梁的振动被旋涡演变所驱动.在主梁表面风压脉动的本征模态中存在涡振的主导模态,其卓越频率与结构固有频率一致.受临时设施影响,本征模态中的风压波动主要集中于顶板区域.
To investigate the influence of bridge deck temporary facilities on the vortex-induced vibration(VIV) of the main girder, the VIV of a certain long-span suspension bridge was simulated using computational fluid dynamics. The variation of the flow field was studied. The spatial and temporal distribution characteristics of the surface pressure of the main girder under vortex-induced conditions were analyzed using the proper orthogonal decomposition method(POD). The results show that temporary facilities lead to a large vortex in the flow field on the top of the main girder, but the vortex shape is stable without VIV. In the case of vortex-induced vibration of the main girder, separation, reattachment, and shedding in a period of vibration occur in succession at the top vortex. The vibration of the main girder is driven by the evolution of the vortex. The dominant VIV mode exists in the model, and its dominant frequency is in agreement with the natural frequency of the structure. Due to temporary facilities, the surface pressure fluctuation is mainly concentrated in the roof area of the main girder.
作者
郎天翼
王浩
贾怀喆
刘震卿
徐梓栋
郜辉
Lang Tianyi;Wang Hao;Jia Huaizhe;Liu Zhenqing;Xu Zidong;Gao Hui(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Architecture and Civil Engineering School,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第5期833-840,共8页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51978155)
国家高层次人才特殊支持计划资助项目(W03070080)
中央高校基本科研业务基金资助项目(2242020k1G013)。
关键词
涡振
临时设施
风压分布
本征正交分解
vortex-induced vibration
temporary facilities
wind pressure distribution
proper orthogonal decomposition
